When you mix calcium chloride (CaCl₂) with copper sulfate (CuSO₄), you'll get a precipitation reaction. Here's what happens:

* The reaction: Calcium chloride and copper sulfate react to form calcium sulfate (CaSO₄) and copper chloride (CuCl₂).

```

CaCl₂(aq) + CuSO₄(aq) → CaSO₄(s) + CuCl₂(aq)

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* The precipitate: Calcium sulfate (CaSO₄) is insoluble in water, meaning it doesn't dissolve well. This causes it to form a solid precipitate, appearing as a white cloudy substance in the solution.

* The solution: Copper chloride (CuCl₂) remains dissolved in the solution. It gives the solution a slightly blue-green tint.

In summary: Mixing calcium chloride and copper sulfate results in the formation of a white calcium sulfate precipitate and a solution containing copper chloride.